Malicious PDF — malware analysis report

Static analysis result for SHA-256 d712da3739477576…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 09:47:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bba0d0e40f7821f4073a3ced6a750004 SHA-1: 6a33a76612b9d49f0d286c68678d09e12e66afda SHA-256: d712da37394775769e940fc9e9ed698237739bd38f434f50af6a9d73c2af2b4b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple lures for free game hacks and spins, directing users to a malicious redirector. This redirector, in turn, hosts a large number of SEO-optimized PDF links, indicating a likely phishing or scam campaign designed to drive traffic to potentially malicious sites. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/free-spin-link-game-hack In PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hack-menu-for-roblox_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/wild-savannah-roblox-how-to-change-colours-hack_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/haw-to-get-money-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-pet-simulator-how-to-get-a-free-rainbow-dominus_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/chowder-land-free-admin-mega-place-update-site-robloxcom_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/eternial-moon-skylight-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-tiktok-followers-royal-key_GM835599320.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-do-u-get-robuxs-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BB 22236 bytes
SHA-256: 0337673f6310f4f25ca24dadafb9f69405bd2bea1affe8dba7fbf331873dcad3
font_01_sfnt_off000061dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DD 18096 bytes
SHA-256: a2e26d43a170bbc72ff377da92d823caf5fd34af2d54d5e58167bc484aeb8b2c

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